I now have 35,000 on my truck, no boxes yet although I just ordered a tst box. I just noticed recently my truck reving in between gears, in other words I shift from 3rd to 4th or which ever and it does not de-cellerate like it should or let up as quickly as it did. It feels as if it is still feeding fuel. My rpm will stay at 2500 or my shift point, for a split second before de-cellerating. I first thoght it was my imagination or shifting habits changing but I don't think so. Is this a problem? Any one else notice similar symtoms?